A. O. Smith became the US largest water heater manufacturer of the industry by holding the patent technology of glass-lined special protective tank in 1936.
A. O. Smith became the US largest water heater manufacturer of the industry by holding the patent technology of glass-lined special protective tank in 1936.
1936年A.O.史密斯就凭藉“金圭特护内胆”专利技术成为美国热水器行业最大的制造商之一。